If you want real-time communication but absolutely refuse to use slack, you can hang out in #angr on freenode. Responsiveness here, realistically, is lower than on slack, unfortunately.

You can file an issue or send us a PR on github in the appropriate repo.

If you prefer email, and don't mind longer response times, shoot an email to angr-at-lists.cs.ucsb.edu. This is a public mailing list (to which you can subscribe here).

In all this, please keep in mind that angr is a large project being frantically worked on by a very small group of overworked students. It's open source, with a typical open source support model (i.e., pray for the best).

Semi-academically, angr was one of the underpinnings of Shellphish's Cyber Reasoning System for the DARPA Cyber Grand Challenge, enabling them to win third place in the final round (more info here)! Shellphish has also used angr in many CTFs.